aiohttp unix socket 启动简单说明

aiohttp 官方推荐了不少部署模式，以下是关于unix socket 部署的简单说明

参考配置

  • web.py
from aiohttp import web
import argparse
parser = argparse.ArgumentParser(description="aiohttp app")
parser.add_argument('--path')
async def hello(request):
    return web.Response(text="Hello, world")
if __name__ == '__main__':
    args = parser.parse_args()
    app = web.Application()
    app.add_routes([web.get('/', hello)])
    # 核心是path
    web.run_app(app,path=args.path)
  • 启动
python tests/web.py    --path=demo.sock

访问

  • curl 模式格式
curl --unix-socket demo.sock  http://localhost/
  • 实际访问
    推荐基于Supervisord的多集成模式，可以运行多个unix socket 这样可以提高系统资源利用率
    nginx 参考配置
http {
  upstream aiohttp {
    # fail_timeout=0 means we always retry an upstream even if it failed
    # to return a good HTTP response
 
    # Unix domain servers
    server unix:/tmp/web_1.sock fail_timeout=0;
    server unix:/tmp/web_2.sock fail_timeout=0;
    server unix:/tmp/web_3.sock fail_timeout=0;
    server unix:/tmp/web_4.sock fail_timeout=0;
 
    # Unix domain sockets are used in this example due to their high performance,
    # but TCP/IP sockets could be used instead:
    # server 127.0.0.1:8081 fail_timeout=0;
    # server 127.0.0.1:8082 fail_timeout=0;
    # server 127.0.0.1:8083 fail_timeout=0;
    # server 127.0.0.1:8084 fail_timeout=0;
  }
}

Supervisord

[program:aiohttp]
numprocs = 4
numprocs_start = 1
process_name = web%(process_num)s
 
; Unix socket paths are specified by command line.
command=/path/to/web.py --path=/tmp/web_%(process_num)s.sock
 
user=nobody
autostart=true
autorestart=true

aiohttp 对于unix socket 的处理

  • aiohttp/web.py
    可以看到如path 不为空，aiohttp 在sites 就会添加unix socket，同时还会判断是否是多个
 if path is not None:
            if isinstance(path, (str, os.PathLike)):
                sites.append(
                    UnixSite(
                        runner,
                        path,
                        ssl_context=ssl_context,
                        backlog=backlog,
                    )
                )
            else:
                for p in path:
                    sites.append(
                        UnixSite(
                            runner,
                            p,
                            ssl_context=ssl_context,
                            backlog=backlog,
                        )
                    )
  • UnixSite 处理
    start 方法中通过asyncio创建的unix_server
async def start(self) -> None:
    await super().start()
    loop = asyncio.get_event_loop()
    server = self._runner.server
    assert server is not None
    self._server = await loop.create_unix_server(
        server,
        self._path,
        ssl=self._ssl_context,
        backlog=self._backlog,
    )

说明

为了提高系统的性能基于unix socket 是一个很不错的选择，也是不少项目优先选择

参考资料

https://docs.aiohttp.org/en/stable/deployment.html
http://supervisord.org/
aiohttp/web.py
aiohttp/web_runner.py

posted on 2024-03-22 08:24  荣锋亮  阅读(9)  评论(0)  编辑  收藏  举报

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